22 - python & all web labs

labPython/lab21/task_4.py

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+class SimpleIter4:
+    def __init__(self, data):
+        self.data = data
+        self.result = []
+        evens = [data[i] for i in range(0, len(data), 2)][::-1]
+        odds = [data[i] for i in range(1, len(data), 2)]
+        self.result = evens + odds
+        self.index = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.index >= len(self.result):
+            raise StopIteration
+        val = self.result[self.index]
+        self.index += 1
+        return val
+
+
+while True:
+    print("1 - Ввести список")
+    print("0 - Выход")
+    choice = input("Выбор: ")
+
+    if choice == "0":
+        break
+
+    if choice == "1":
+        try:
+            data = input("Введите элементы через пробел: ").split()
+            it = SimpleIter4(data)
+            for x in it:
+                print(x)
+        except:
+            print("Ошибка")